=proto
void duk_require_stack_top(duk_context *ctx, unsigned int top);

=summary
<p>Like <tt><a href="#duk_check_stack_top">duk_check_stack_top()</a></tt>
but an error is thrown if the value stack needs to be reallocated and that
reallocation fails.</p>

<p>As a general rule, callers should use this function to reserve more
stack space.  If value stack cannot be extended, there is almost never a
useful recovery strategy except to throw an error and unwind.</p>

=example
duk_require_stack_top(ctx, 100);
printf("value stack guaranteed up to index 99\n");

=tags
stack

=seealso
duk_check_stack_top